The idea of "centrism" makes no sense with Trumpism on one side. "Yes I am pro-democratic republic and I also want to be ruled by a dictator who hollows out and weaponizes public institutions and muzzles his enemies."
The center means there is common ground but Trump scorched the GOP's half of it. The only way I can envision a center is if the GOP figures out how to move beyond Trumpism and rebuild themselves into a conservative party. Currently the only people offering a shred of hope, by for example cooperating with the Democratic center, are the likes of Romney, who got booed offstage by GOP supporters.